1. Department of Neurosurgery, Zhumadian Central Hospital, Zhumadian, Henan 463000, P.R. China
2. Medical Department, Zhumadian Central Hospital, Zhumadian, Henan 463000, P.R. China
3. Department of Interventional Radiotherapy, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China